ip link: Fix indenting in help text

ip link: Fix indenting in help text

Indenting of 'ip link set' options below 'link-netns' was wrong, they
should be on the same level as the above.

While being at it, fix closing brackets in vf-specific options. Also
write node/port_guid parameters in upper-case without curly braces: They
are supposed to be replaced by values, not put literally.

Fixes: 8589eb4efdf2a ("treewide: refactor help messages")
Fixes: 5a3ec4ba64783 ("iplink: Update usage in help message")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>